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This paper studies the error performance of a high-rate bit-interleaved coded modulation with iterative decoding (BICM-ID) system using superposition modulation over a nonorthogonal amplify-and-forward (NAF) half-duplex single relay channel. Based on extrinsic information transfer (EXIT) chart analysis, we investigate both asymptotic coding gain and the convergence property of the systems under consideration...
The paper focuses exclusively on a new proposed model, which is joining equalizer with serial turbo code over a mobile frequency selective channel. The separation between equalizer and decoder is presented in the system for comparison, where there is no feedback connection between them. The proposed model depends on a Log-MAP algorithm. Therefore some modifications of Soft In Soft Out SISO output...
This paper studies the quality of transmitted multi-view video when the corrupted packets are not discarded by the underlying protocols of the decoder. It assumes a wireless channel where the errors can be significant and implements solutions within the current H.264-MVC to reduce their impact on the video quality perceived by the user. The results show that transmission errors drastically reduce...
Fountain codes, as a kind of rateless codes, can be used to transmit information over any unstable channels. In wireless communications, the channels may suffer from different kinds of fading, which results in unpredictable performance in some scenarios. In this paper, we start to investigate the performance of fountain codes over wireless channels by taking its encoding mechanism into account. Here...
In this paper, a transmission strategy of fountain codes over cooperative relay networks is proposed. When more than one relay nodes are available, we apply network coding to fountain-coded packets. By doing this, partial information is made available to the destination node about the upcoming message block. It is therefore able to reduce the required number of transmissions over erasure channels,...
First, the Han-Kobayashi (HK) rate region for general interference channel (IC) is partially improved allowing the input random variables to be correlated. Second, considering a general input distribution and using a combination of the HK jointly decoding strategy, Marton like coding and binning scheme, we obtain a new achievable rate region for the cognitive radio channel (CRC) and show that this...
The new JPEG XR image encoding standard offers a great compression rate while maintaining a good visual quality. Nonetheless, it has low error robustness, making it unusable in case of unreliable transmission over error prone channels, e.g., wireless channels. An improvement to the standard was developed, which can correct transmission errors, both bit or packet losses, and which is fully compatible...
For the application of LDPC in relay channel, a new matrix construction method for LDPC code is presented. The parity bits generated by the relay node are viewed as part of the whole code in the destination thus can be transmitted directory to the destination without the second coding process. The destination decodes the messages from both the source and the relay with a jointed matrix presented in...
We address the design of adaptive channel codes for the three-node relay channel. In order to make the code design feasible for wireless sensor-network (WSN) applications, we focus on the special case where only limited channel-state information is available for code adaptation. For this purpose we design distributed codes which feature a limited set of modes which are optimized to serve a certain...
A novel adaptive Turbo equalization algorithm based on the serious inter-symbol interference (ISI) in wireless channel is proposed. The channel characteristics are estimated through combining iterative recursive least square (RLS) with least mean square(LMS) and channel's changes are traced; and the soft interference cancellation (SIC) algorithm for Turbo equalization and the iterative calculations...
Despite much research on the throughput of relaying networks under idealized interference models, many practical wireless networks rely on physical-layer protocols that preclude the concurrent reception of multiple transmissions. In this work, we develop analytical frameworks for the uplink of a multi- source single-channel relay-aided wireless system where transmissions are scheduled to avoid collisions...
It is known that MIMO detectors performance is highly influenced by the channel matrix condition number. An efficient way to decrease the channel matrix condition number is the use of Lattice Reduction techniques. In this paper a Lattice-Reduction-Aided (LRA) K-Best detector based on the channel matrix condition number is proposed for improving the performance of conventional K-Best algorithm. This...
Sphere Detection (SD) method has been used as a powerful mean to find Maximum Likelihood (ML)solution to the detection problem of Multiple-Input Multiple-Output (MIMO) channels with lower complexity. This method searches closest lattice point inside a sphere. This paper discusses the effect of initial radius of the sphere on the complexity and performance of SD in different noise variances, constellation...
Motivated from results for the point-to-point block MIMO channels without channel knowledge, we investigate possible communication schemes for the non-coherent two-way relaying channel. We propose one construction where the code is constructed from packings in Grassmann manifolds and evaluate the performance of the coding scheme.
Arikan's polar coding method is extended to two-user multiple-access channels. It is shown that if the two users of the channel use the Arikan construction, the resulting channels will polarize to one of five possible extremals, on each of which uncoded transmission is optimal. The sum rate achieved by this coding technique is the one that corresponds to uniform input distributions. The encoding and...
Error control codes are used to protect information from errors that can occur during transmission. Reed Solomon (RS) code is one of the most important and best known classes of nonbinary Bose-Chaudhuri-Hocquenqhen (BCH) codes which are capable of correcting burst errors (C. Xu, 2007)[2]. RS code is a type of forward error correction (FEC) codes used in data transmission for real time applications...
Cooperative relaying technique has shown potential in enhancing coverage area and reliability of transmission by forming virtual arrays. Opportunistic relaying tries to utilize best available channel between source and destination. Outage performance of relay based system can be improved through proper allocation of power and positioning of relay node. Analytical expression for outage probability...
In this paper, we analyze and simulate performance of space time block coded (STBC) binary pulse amplitude modulation-direct sequence (BPAM-DS) ultra-wideband (UWB) systems with double binary turbo code in indoor environments. The indoor wireless channel is modeled as a modified Saleh and Valenzuela (SV) channel, which is proposed as a UWB indoor channel model by IEEE 802.15.SG3a. From simulation...
The Scalable Video Coding (SVC) provides the spatial, temporal, and quality scalability of SVC with which a terminal station can have different playback video quality dynamically according to the radio channel condition and the capacity of the terminal station. Under the concept of layer-separation of the OSI layer model, however, existing access network techniques are upper layer-unaware. While the...
This article at first introduces the development of the channel coding technology driven by the Shannon's theory, and the tendency that the coding and modulation will be combined. Then it elaborates on the channel coding problems under the wireless channel. At last it discusses the development direction of the coding technology, that is, when considering the specific wireless communication environment,...
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